The British-based Syrian Observatory for Human Rights confirmed the temple's destruction Sunday. Last week it said the militants publicly beheaded the former antiquities director for Palmyra, Khaled Asaad. He had spent 50 years working to preserve the fragile history of the U.N. world heritage site.

Baal Shamin temple, Palmyra, Syria

Islamic State seized Palmyra in May and historians immediately issued a global alarm. The militants say ancient artifacts and statues are blasphemous. They have also destroyed other historic sites in Iraq.

But the Observatory says Islamic State has sold a number of ancient pieces to raise money. It says some videos showing extremists blowing up statues and works of art are faked.